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The label does look like foil -- easier to see if you look at the gold and red coloring on it. Never posted a pic before (I "borrowed" the ebay shot), but I'll give it a go this weekend.

I agree -- it does look like slate. There is no typical BBW patterning, as noted in the OP. However, from the side the gradual fade of the BBW into the coti and the wavy border indicates it is a...

http://img.auctiva.com/imgdata/1/2/1/8/7/4/5/webimg/403179720_o.jpg

Here it is. BTW, any suggestions for removing (intact) or preserving the label? I'd like to use at least the coti side. Thanks.

I recently acquired a Belgian "Deep Rock" originally distributed through Pearl Duck. I understand these stones originally were mined from the deeper layers of a coticule quarry.

I have several...